It could take 100 years and cost more than $24.5 million to save the Mount Graham red squirrel, according to a revised recovery plan for the endangered rodent.
- Howard Fischer
A Tucson-based environmental group is accusing the Trump administration of moving at a snail's pace in determining whether a sesame-sized mollusk found only in Organ Pipe Cactus National Monument in southwest Arizona should be listed as endangered.
- Clara Migoya, Arizona Republic
The federal funding for the Arizona cleanup is part of a national $1 billion annual appropriation that the former Biden-Harris administration earmarked for PFAS and emerging contaminants
Tucson, Phoenix create water-sharing plan as Colorado River shrinks- Tony Davis
For Star subscribers: Tucson and Phoenix have a plan in which city with more water than it needs at the moment can share it.
- Henry Brean
For Star subscribers: Wildlife officials are planning an emergency rescue for an endangered species that could see its only U.S. habitat wiped out by construction of a second border wall across Southern Arizona.
- Hannah Cree
The Project Blue data center will use groundwater from two new wells being drilled on the property.
- Henry Brean
The endangered Sonoyta pupfish has apparently disappeared from its native range in Mexico, leaving just one remaining wild population at Quitobaquito Springs in southwestern Pima County.
Nearly 75 groups and other entities representing a wide range of interests want Congress to pony up at least $2 billion to invest in water conservation and efficiency programs and "smart, targeted" projects to increase available supplies in the drought-stricken Colorado River Basin.
A judge in Maricopa County is trying to determine who is the rightful owner of a winning The Pick ticket that was printed at a Scottsdale Circle K but was not purchased that day.
Opponents of the Copper World mining project in the Santa Rita Mountains have placed a lien on 160 acres of state land that mine developer Hudbay Minerals Inc. purchased to keep the land from being developed for now.
Arizona, Nevada and California would still have to take massive cuts in their Colorado River water supplies under a new, preliminary plan devised by the U.S. Bureau of Reclamation, Arizona water officials said Wednesday.
Video footage of jaguars in Southern Arizona is extremely rare, but the region's newest cat has shown up on camera multiple times lately.
The Santa Cruz River is a sprawling watershed stretching through Southern Arizona from Marana to northern Mexico. And it’s being reshaped by invasive plants.
A proposal from Arizona, California and Nevada to shave their take from the Colorado River for the next 30 months is drawing favorable reactions from a large majority of outside experts interviewed about it.
Very dry and warm weather in the winter and early spring means Colorado River flows into Lake Powell will hit record lows this summer, a new federal forecast says.
The federal government has agreed to pump more than $450 million into programs to carry out additional Colorado River water conservation, Arizona Department of Water Resources chief Tom Buschatzke said Monday.
Arizona, California and Nevada say they've put together a proposal to stabilize the ailing Colorado River by saving at least 3.2 million acre-feet of water through 2028.
For Star subscribers: As border wall construction accelerates, ecologists are cataloging wildlife on both sides of the international boundary and tracking the movements of rare species like jaguar and ocelot in Southern Arizona.
Factors that limit access to nature for Mexican immigrants and low-income communities in Tucson is most linked to economic and structural barriers, a new study says.
While it's clear Lake Mead will get less water from Lake Powell this year, it's not clear how that cut will affect how much water Arizona and the other two Lower Colorado River Basin states will get from Mead as a result.
The federal government's move to slash releases of Colorado River water from Lake Powell to Lake Mead takes the region one step closer to litigation over the century-old Colorado River Compact.
PHOENIX — Arizona judges won't force state officials to determine if there should be greater state oversight of water use along the upper San Pedro River.
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Lower water levels at Lake Mead are likely to lead to higher prices for electricity from Hoover Dam — prices high enough to make the power unaffordable to at least some of the dam's customers, a state official says.
An invasive plant known as stinknet is rapidly spreading across Southern Arizona, raising concerns about wildfire risk and environmental damage. Experts warn the aggressive yellow weed can choke out native plants, fuel hotter fires and even pose health risks — urging residents to remove it now before it takes over.
For generations, the presence of Hoover Dam and its massive power plant routinely translated into cheap electricity for cities, farmers, irrigation districts and other major electrical energy users in Arizona and the Southwest.
PHOENIX — A judge ruled the Arizona Department of Water Resources acted illegally when it changed how it determined if there was enough groundwater available to support new homes in metro Phoenix in 2023 and left builders thousands of lots they could not develop.
Wildlife officials tell people to leave baby animals alone, but that's a tall order for an Oro Valley bar and restaurant with great horned owls nesting on its patio.
The goal is to prevent Lake Powell from falling so low that Glen Canyon Dam would no longer be able to generate electricity.
The Bureau of Reclamation says it plans to substantially increase Colorado River water releases from reservoirs upstream of Lake Powell and to reduce releases from Powell to Lake Mead. The purpose of these actinos will be to keep Powell from falling below the level at which turbines at the adjoining Glen Canyon Dam can generate electricity.
A map published by the U.S. Department of Homeland Security reveals plans to add a second border wall along much of the U.S.-Mexico border, includng nearly all of Arizona's southern boundary.